High to low K/D Primaries only:
1. AN 97 (highest KD 1.5+ 1980 kills)
3. MK 48
5. SWAT-556 (lowest on top-5 KD 1.31 1455 kills)
Side note: Worst KD weapons
Skorpion Evo - 0.94 kd for 1442 kills [obviously I dislike high RoF weapons]
KSG - 0.99 kd for 495 kills
SMR - 1.0 kd for 1613 kills.
I don't use any of the weapons as a stable one - I prestige & then move on.
NOTE: Does anyone else see the "Peacekeeper" listed on your ELITE Weapons-list too? I can see it on there.